The HomeStyle Energy Mortgage from Fannie Mae enables a homebuyer or mortgage refinancer to add a solar system after the mortgage loan has closed.
The Rocky Mountain Institute calls this "A Game Changer for the Solar Industry."
The Shockingly Short Payback of Energy Modeling /
A study by HOK finds that the payback period for doing energy modeling on a project is typically 1 or 2 months!
HERS and IECC /
Should the HERS Index become a compliance path to meet the IECC? "Beware unintended consequences."
William Fay, Executive Director of Energy Efficient Codes Coalition, examines the pros and cons here: http://www.greenbuildermedia.com/codewatch/mandatory-hers-rating